1. Which instrument is used to measure pressure of gases ?
Manometer
Machmeter
Magnetometer
Micrometer
Answer: Option A
Explanation:
Machmeter - is used to determine the speed of an aircraft in terms of speed of sound,
Magnetometer - is used to compare magnetic movements and fields,
Micrometer - is used to convert sound waves into electrical vibrations.
2. Which instrument is used to measure the power of electric circuit ?
Voltmeter
Wattmeter
Wavemeter
Viscometer
Answer: Option B
Explanation:
Voltmeter - is used to measure electric potential difference between two points,
Wavemeter - is used to measure the wavelength of a radiowave,
Viscometer - is used measure viscosity of liquid.
3. Scalar Quantities are
physical quantities which have magnitude only and no direction
physical quantities which have no magnitude only and only direction
physical quantities which have magnitude only and direction
physical quantities which have no magnitude and no direction
Answer: Option A
4. Which unit we use to express Nuclear sizes ?
Tesla
Newton
Fermi
None of above
Answer: Option C
5. Which instrument is used to measure heat radiation ?
Radar
Salinometer
Refractometer
Radio micrometer
Answer: Option D
Explanation:
Radar - is used to detect the direction and speed of an object by means of radiowaves,
Salinometer - is used to determine salinity of solutions,
Refractometer - is used to measure refractive indices.